Definition: You are given a question on high school physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following types of electromagnetic radiation has the longest wavelength?
(A)Gamma rays (B)Ultraviolet (C)Blue light (D)Orange light

D